Door Switch; Control Thermostat And Bias Heater - GE DBL333 Technical Service Manual

Depending on the dryer model, the timer can have
one or two resistors connected to it. Refer to the
wiring diagram with the dryer.
On electric model dryers with an automatic dry cycle,
a 4.4K ohm resistor is used in series with the heater
to reduce the 240 volts to 120 volts and run the timer
motor when the control thermostat is open.
NOTE: The automatic dry cycle resistor resembles
a jumper wire between the terminals TM and R on
the timer.
4.4K OHM RESISTOR
A second type resistor will be used on gas or electric
model dryers with a medium heat setting. This
resistor is wired in series with the bias heater on the
control thermostat to cycle the thermostat at a lower
temperature.
To replace the timer, remove the timer knob and the
two Phillips screws under the knob.
Automatic Dry
Resistor
Medium Heat
Resistor
MEDIUM HEAT
RESISTOR
10

Door Switch

The door switch is a normally open switch wired in
series with the drive motor. When the door is closed
and the motor running, a circuit is completed through
the motor's run winding. To test the switch, remove
the top panel and wires from the switch. When the
door is closed, the switch should read continuity.
When the door is open, the switch should read open.
To replace the switch, squeeze the retaining clips
together and pull the switch from the front of the
dryer.

Control Thermostat and Bias Heater

The control thermostat regulates the temperature
inside the dryer drum. It is a single pole, single throw
switch wired in series with the high limit (or safety)
thermostat and the heat source. It is mounted on
the front of the blower housing. The control
thermostat also contains a bias heater. The purpose
of the bias heater is to apply a small amount of heat
to the control thermostat when the fabric selector
switch is set to the medium temperature setting. This
small amount of heat causes the thermostat to open
sooner to maintain a lower drum temperature.
THERMOSTAT
TERMINALS
BIAS HEATER
TERMINALS
NOTE:
The control thermostats are not interchangeable
between an electric and a gas dryer. The resistance
of the bias heater is 28K ohms on the electric dryer
and 7K ohms on the gas dryer.